java.lang.StackOverflowError
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:787)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:447)
at java.net.URLClassLoader.access$100(URLClassLoader.java:71)
at java.net.URLClassLoader$1.run(URLClassLoader.java61)
at java.net.URLClassLoader$1.run(URLClassLoader.java55)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java54)
at java.lang.ClassLoader.loadClass(ClassLoader.java:423)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java08)
at java.lang.ClassLoader.loadClass(ClassLoader.java56)
at net.minecraft.server.v1_4_6.World.m(World.java:487)
at net.minecraft.server.v1_4_6.World.applyPhysics(World.java:458)
at net.minecraft.server.v1_4_6.World.update(World.java:424)
at net.minecraft.server.v1_4_6.World.setTypeId(World.java:400)
at net.minecraft.server.v1_4_6.BlockFlower.c(SourceFile:47)
at net.minecraft.server.v1_4_6.BlockFlower.doPhysics(SourceFile6)
at net.minecraft.server.v1_4_6.World.m(World.java:485)
at net.minecraft.server.v1_4_6.World.applyPhysics(World.java:458)
at net.minecraft.server.v1_4_6.World.update(World.java:424)
at net.minecraft.server.v1_4_6.World.setTypeId(World.java:400)
at net.minecraft.server.v1_4_6.BlockFlower.c(SourceFile:47)
at net.minecraft.server.v1_4_6.BlockFlower.doPhysics(SourceFile6)
at net.minecraft.server.v1_4_6.World.m(World.java:485)
at net.minecraft.server.v1_4_6.World.applyPhysics(World.java:458)
at net.minecraft.server.v1_4_6.World.update(World.java:424)
at net.minecraft.server.v1_4_6.World.setTypeId(World.java:400)
at net.minecraft.server.v1_4_6.BlockFlower.c(SourceFile:47)
at net.minecraft.server.v1_4_6.BlockFlower.doPhysics(SourceFile6)
at net.minecraft.server.v1_4_6.World.m(World.java:485)
at net.minecraft.server.v1_4_6.World.applyPhysics(World.java:461)
at net.minecraft.server.v1_4_6.World.update(World.java:424)
at net.minecraft.server.v1_4_6.World.setTypeId(World.java:400)
at net.minecraft.server.v1_4_6.BlockFlower.c(SourceFile:47)

//Großer Teil entfernt!

A detailed walkthrough of the error, its code path and all known details is as follows:
---------------------------------------------------------------------------------------

-- Head --
Stacktrace:
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:787)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:447)

-- Block being updated --
Details:
Source block type: ID #142 (tile.potatoes // net.minecraft.server.v1_4_6.BlockPotatoes)
Block type: ID #142 (tile.potatoes // net.minecraft.server.v1_4_6.BlockPotatoes)
Block data value: 0 / 0x0 / 0b0000
Block location: World: (234,33,363), Chunk: (at 10,2,11 in 14,22; contains blocks 224,0,352 to 239,255,367), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
Stacktrace:
at net.minecraft.server.v1_4_6.World.m(World.java:488)
at net.minecraft.server.v1_4_6.World.applyPhysics(World.java:458)
at net.minecraft.server.v1_4_6.World.update(World.java:424)
at net.minecraft.server.v1_4_6.World.setTypeId(World.java:400)
at net.minecraft.server.v1_4_6.BlockFlower.c(SourceFile:47)
at net.minecraft.server.v1_4_6.BlockFlower.doPhysics(SourceFile6)
at net.minecraft.server.v1_4_6.World.m(World.java:485)
at net.minecraft.server.v1_4_6.World.applyPhysics(World.java:458)
at net.minecraft.server.v1_4_6.World.update(World.java:424)
at net.minecraft.server.v1_4_6.World.setTypeId(World.java:400)
at net.minecraft.server.v1_4_6.BlockFlower.c(SourceFile:47)
at net.minecraft.server.v1_4_6.BlockFlower.doPhysics(SourceFile6)
at net.minecraft.server.v1_4_6.World.m(World.java:485)
at net.minecraft.server.v1_4_6.World.applyPhysics(World.java:461)
at net.minecraft.server.v1_4_6.World.update(World.java:424)
at net.minecraft.server.v1_4_6.World.setTypeId(World.java:400)
at net.minecraft.server.v1_4_6.BlockFlower.c(SourceFile:47)
at net.minecraft.server.v1_4_6.BlockFlower.doPhysics(SourceFile6)
at net.minecraft.server.v1_4_6.World.m(World.java:485)
at net.minecraft.server.v1_4_6.World.applyPhysics(World.java:461)
at net.minecraft.server.v1_4_6.World.update(World.java:424)
at net.minecraft.server.v1_4_6.World.setTypeId(World.java:400)
at net.minecraft.server.v1_4_6.BlockFlower.c(SourceFile:47)
at net.minecraft.server.v1_4_6.BlockFlower.doPhysics(SourceFile6)
at net.minecraft.server.v1_4_6.World.m(World.java:485)
at net.minecraft.server.v1_4_6.World.applyPhysics(World.java:459)
at net.minecraft.server.v1_4_6.World.update(World.java:424)
at net.minecraft.server.v1_4_6.World.setTypeId(World.java:400)
at net.minecraft.server.v1_4_6.BlockFlower.c(SourceFile:47)
at net.minecraft.server.v1_4_6.BlockFlower.doPhysics(SourceFile6)
at net.minecraft.server.v1_4_6.World.m(World.java:485)
at net.minecraft.server.v1_4_6.World.applyPhysics(World.java:459)
at net.minecraft.server.v1_4_6.World.update(World.java:424)